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PATH: opt / alt / python38 / lib64 / python3.8 / site-packages / playhouse

"""
Support for using a dedicated read-slave. The read database is specified as a
Model.Meta option, and will be used for SELECT statements:

master = PostgresqlDatabase('master')
read_slave = PostgresqlDatabase('read_slave')

class BaseModel(ReadSlaveModel):
    class Meta:
        database = master
        read_slaves = [read_slave]  # This database will be used for SELECTs.

# Now define your models as you would normally.
class User(BaseModel):
    username = CharField()

# To force a SELECT on the master database, you can instantiate the SelectQuery
# by hand:
master_select = SelectQuery(User).where(...)
"""
from peewee import *

class ReadSlaveModel(Model):
    @classmethod
    def _get_read_database(cls):
        if not getattr(cls._meta, 'read_slaves', None):
            return cls._meta.database
        current_idx = getattr(cls, '_read_slave_idx', -1)
        cls._read_slave_idx = (current_idx + 1) % len(cls._meta.read_slaves)
        return cls._meta.read_slaves[cls._read_slave_idx]

@classmethod
    def select(cls, *args, **kwargs):
        query = super(ReadSlaveModel, cls).select(*args, **kwargs)
        query.database = cls._get_read_database()
        return query

@classmethod
    def raw(cls, *args, **kwargs):
        query = super(ReadSlaveModel, cls).raw(*args, **kwargs)
        if query._sql.lower().startswith('select'):
            query.database = cls._get_read_database()
        return query

[-] csv_loader.py [edit]
[-] reflection.py [edit]
[-] dataset.py [edit]
[-] migrate.py [edit]
[+] ..
[-] kv.py [edit]
[-] gfk.py [edit]
[-] pool.py [edit]
[-] csv_utils.py [edit]
[-] sqlite_udf.py [edit]
[-] signals.py [edit]
[-] postgres_ext.py [edit]
[-] sqliteq.py [edit]
[-] _sqlite_ext.cpython-38-x86_64-linux-gnu.so [edit]
[-] fields.py [edit]
[-] _speedups.cpython-38-x86_64-linux-gnu.so [edit]
[+] __pycache__
[-] apsw_ext.py [edit]
[-] djpeewee.py [edit]
[-] shortcuts.py [edit]
[-] db_url.py [edit]
[-] sqlcipher_ext.py [edit]
[-] test_utils.py [edit]
[-] read_slave.py [edit]
[-] __init__.py [edit]
[-] berkeleydb.py [edit]
[-] hybrid.py [edit]
[-] flask_utils.py [edit]
[-] sqlite_ext.py [edit]
[-] _sqlite_udf.cpython-38-x86_64-linux-gnu.so [edit]